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518
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12 /*
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13 * FreeBSD file AIO features and quirks:
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14 *
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15 * if an asked data are already in VM cache, then aio_error() returns 0,
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16 * and the data are already copied in buffer;
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17 *
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18 * aio_read() preread in VM cache as minimum 32K;
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19 *
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20 * aio_read/aio_error() may return EINPROGRESS for just written data;
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21 *
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22 * kqueue EVFILT_AIO filter is level triggered only: an event repeats
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23 * until aio_return() will be called;
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24 *
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25 * aio_cancel() can not cancel file AIO: it returns AIO_NOTCANCELED always.
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26 */
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27
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28
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29 extern int ngx_kqueue;
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30
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31
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32 static ssize_t ngx_file_aio_result(ngx_file_t *file, ngx_event_aio_t *aio,
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33 ngx_event_t *ev);
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34 static void ngx_file_aio_event_handler(ngx_event_t *ev);
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35
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36
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37 ssize_t
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38 ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset,
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39 ngx_pool_t *pool)
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40 {
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41 int n;
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42 ngx_event_t *ev;
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43 ngx_event_aio_t *aio;
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44 static ngx_uint_t enosys = 0;
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45
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46 if (enosys) {
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47 return ngx_read_file(file, buf, size, offset);
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48 }
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49
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50 aio = file->aio;
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51
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52 if (aio == NULL) {
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53 aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t));
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54 if (aio == NULL) {
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55 return NGX_ERROR;
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56 }
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57
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58 aio->file = file;
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59 aio->fd = file->fd;
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60 aio->event.data = aio;
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61 aio->event.ready = 1;
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62 aio->event.log = file->log;
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63 file->aio = aio;
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64 }
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65
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66 ev = &aio->event;
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67
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68 if (!ev->ready) {
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69 ngx_log_error(NGX_LOG_ALERT, file->log, 0,
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70 "second aio post for \"%V\"", &file->name);
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71 return NGX_AGAIN;
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72 }
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73
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74 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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75 "aio complete:%d @%O:%z %V",
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76 ev->complete, offset, size, &file->name);
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77
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78 if (ev->complete) {
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79 ev->complete = 0;
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80 ngx_set_errno(aio->err);
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81
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82 if (aio->err == 0) {
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83 return aio->nbytes;
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84 }
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85
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86 return NGX_ERROR;
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87 }
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88
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89 ngx_memzero(&aio->aiocb, sizeof(struct aiocb));
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90
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91 aio->aiocb.aio_fildes = file->fd;
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92 aio->aiocb.aio_offset = offset;
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93 aio->aiocb.aio_buf = buf;
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94 aio->aiocb.aio_nbytes = size;
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95 #if (NGX_HAVE_KQUEUE)
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96 aio->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
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97 aio->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
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98 aio->aiocb.aio_sigevent.sigev_value.sigval_ptr = ev;
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99 #endif
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100 ev->handler = ngx_file_aio_event_handler;
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101
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102 n = aio_read(&aio->aiocb);
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103
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104 if (n == -1) {
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105 n = ngx_errno;
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106
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107 if (n == NGX_EAGAIN) {
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108 return ngx_read_file(file, buf, size, offset);
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109 }
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110
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111 ngx_log_error(NGX_LOG_CRIT, file->log, n,
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112 "aio_read(\"%V\") failed", &file->name);
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113
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114 if (n == NGX_ENOSYS) {
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115 enosys = 1;
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116 return ngx_read_file(file, buf, size, offset);
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117 }
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118
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119 return NGX_ERROR;
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120 }
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121
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122 ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
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123 "aio_read: fd:%d %d", file->fd, n);
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124
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125 ev->active = 1;
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126 ev->ready = 0;
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127 ev->complete = 0;
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128
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129 return ngx_file_aio_result(aio->file, aio, ev);
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130 }
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131
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132
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133 static ssize_t
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134 ngx_file_aio_result(ngx_file_t *file, ngx_event_aio_t *aio, ngx_event_t *ev)
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135 {
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136 int n;
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137 ngx_err_t err;
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138
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139 n = aio_error(&aio->aiocb);
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140
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141 ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
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142 "aio_error: fd:%d %d", file->fd, n);
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143
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144 if (n == -1) {
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145 err = ngx_errno;
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146 aio->err = err;
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147
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148 ngx_log_error(NGX_LOG_ALERT, file->log, err,
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149 "aio_error(\"%V\") failed", &file->name);
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150 return NGX_ERROR;
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151 }
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152
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153 if (n != 0) {
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154 if (n == NGX_EINPROGRESS) {
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155 if (ev->ready) {
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156 ev->ready = 0;
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157 ngx_log_error(NGX_LOG_ALERT, file->log, n,
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158 "aio_read(\"%V\") still in progress",
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159 &file->name);
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160 }
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161
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162 return NGX_AGAIN;
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163 }
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164
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165 aio->err = n;
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166 ev->ready = 0;
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167
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168 ngx_log_error(NGX_LOG_CRIT, file->log, n,
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169 "aio_read(\"%V\") failed", &file->name);
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170 return NGX_ERROR;
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171 }
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172
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173 n = aio_return(&aio->aiocb);
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174
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175 if (n == -1) {
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176 err = ngx_errno;
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177 aio->err = err;
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178 ev->ready = 0;
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179
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180 ngx_log_error(NGX_LOG_ALERT, file->log, err,
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181 "aio_return(\"%V\") failed", &file->name);
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182 return NGX_ERROR;
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183 }
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184
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185 aio->err = 0;
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186 aio->nbytes = n;
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187 ev->ready = 1;
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188 ev->active = 0;
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189
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190 ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
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191 "aio_return: fd:%d %d", file->fd, n);
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192
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193 return n;
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194 }
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195
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196
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197 static void
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198 ngx_file_aio_event_handler(ngx_event_t *ev)
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199 {
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200 ngx_event_aio_t *aio;
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201
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202 aio = ev->data;
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203
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204 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0,
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205 "aio event handler fd:%d %V", aio->fd, &aio->file->name);
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206
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207 if (ngx_file_aio_result(aio->file, aio, ev) != NGX_AGAIN) {
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208 aio->handler(ev);
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209 }
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210 }
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